SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9ef70452048331ff710ee950ad97f957f82a340d0b0126ee29179ae1d20f6c34' 
  AND token = 'NHiWE+/ypWIp1ABx4yB2P5BMZuVKyBhq4lwE2XxfXPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}